We used to have 13 fish but Jack,one of the fish,commited suicide! (he jumped out while we were out of town!) and we had to (kill?) the other one,Norton. (he was VERY VERY sick) People say fish don`t have personalities,But Norton wasn`t scared,of anything he would attack the tube that we clean the tanks out of!!! And Jack was the shyest one ever!!! Before we left he had just started to come up to the top when it was feeding time! It`s really amazing what kind of fish you end up with!